Originally anticipated in October, the three CPUs - two mainstream parts and an Extreme gaming-centric chip - will actually be launched on 23 September, according to Intel documents website Xbit Labs says it has seen.

That date falls on the day of Intel Developer Forum on which the chip giant's executives outline their plans for mobile chippery, so it's not entirely surprising that this key release will be announced on that day.

The three chips will be Core i7 offerings: the i7-720QM, the i7-820QM and the i7-920XM, clocked at 1.6GHz, 1.73GHz and 2.0GHz, respectively. All three have four cores, though HyperThreading will make that appear to the host operating system as if the chips have eight cores.

The 920XM will have a maximum power draw of 55W - the other two will consume no more than 45W. All three connect to the P55M chipset and the combination of CPU and chipset will be branded 'Centrino 3'.

They're not cheap, mind. The Intel documents list the three chips' batch prices as $364, $546 and $1054, respectively. ®